# SDR 4757

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 25, 2007
- Submitted: September 25, 2007
- Operation: General aviation
- Aircraft: [N919FA](https://openairdocs.org/aircraft/N919FA), registered now
- Make and model: Cessna 414A
- Registry model: [Cessna 414A](https://openairdocs.org/model/cessna-414a) (OpenAirDocs)
- Aircraft serial: 414A0628
- Aircraft time: 5,596 hours
- Engine: Cont TSIO520NB
- Engine time: 1,120 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: AEC631397
- Condition: Cracked
- Location: Rt Engine
- Part time: 1,120 hours
- Component: Engine, Cont
- Component part number: TSIO520NB
- Stage of operation: CR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/4757

## Discrepancy

PILOT WAS INFORMED BY LINE PERSONNEL DURING TAXI TO TIE DOWN, THAT ENGINE WAS MAKING A LOUD (AIR PULSING) SOUND. PILOT COULD ONLY HEAR THE SOUND AFTER REMOVING NOISE CANCELLING HEAD SET. PILOT THEN SHUTDOWN ENGINE. INSPECTION REVEALED THE NR 4 CYLINDER TO BE CRACKED AT THE PARTING SURFACE. EXHAUST WAS ESCAPING FROM THE CRACK CAUSING THE (AIR PULSING) SOUND.

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